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MM: Metall- und Materialphysik
MM 19: Electronic Properties I
MM 19.4: Talk
Tuesday, March 28, 2006, 17:15–17:30, IFW B
Effect of Mn doping on the specific heat of the high Tc superconductor YBaCuO — •Ashok Rao1, Radhe Shyam1, Anirban Das1, Y. F. Lin2, K.M. Sivakumar2, Y. -K Kuo2, Bhasker Gahtori3, and S K Agarwal3 — 1Sikkim Manipal Institute of Technology, Majitar,Rangpo, Sikkim-737132,India — 2Department of Physics, National Dong-Hwa University, Hualien 974, Taiwan — 3National Physical Laboratory, K.S. Krishnan Marg, New Delhi-1100012, India.
There have been several efforts to get new super conducting materials while seeking to explain the transport mechanism in ceramic high temperature superconductors [1].Several investigators have carried out the substitution effects in the high Tc superconductors which has helped in understanding the mechanism of superconductivity and to improve the magnetic properties, like flux pinning etc.We present first reports of the investigations of specific heat on Mn-doped compounds Y1Ba2 (Cu1-xMnx)3Oy (0 <x < 2%). The specific heat of the samples was determined using high-resolution ac calorimeter. It is observed that the transition temperature of Mn doped samples of YBaCuO samples do not change appreciably.Jump in specific heat was observed for samples with low concentration of Mn, however for concentrations above 1%, small change in slope is observed. It may be mentioned that replacing 0.5% Cu by Mn has little effect on the transition temperature; however, the jump decreases by a factor of 3.This clearly demonstrates that these constituents are being incorporated into the superconductors as a whole and not in the form of a local cluster. References 1.Rao A 2004 J. Phys. Condens. Matter 16 1439